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electronics and communication engineering exam question papers
1. For real values of x, the minimum value of the function f(x) exp (x) + exp (- x) is
(A): 0
(B): 0.5
(C): 1
(D): 2
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By: guest on 02 Jun 2017 12.54 am
f(x) = ex + e-x f(x) = ex - ex f(x) = 0 ⇒ ex - e-x = 0 f'(x) = ex + e-x ⇒ +ve for x = 0 Thus minimum. Minimum f(x) = e0 + e0 = 2.
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